It's normal to look at facial expressions when you're trying to read emotions, but as Time points out, a recent study suggests that body language might be a better indicator than a facial expression.

The basic idea is that we're a lot better at reading heightened emotions based on body language rather than their facial expression. The suggestion might seem a little counterintuitive, but when speaking with a one of the study's authors, Hillel Aviezer, Time points out that that this is only the case when emotions are at their strongest:

He adds that we do, of course, read a great deal of salient day-to-day emotional information from faces—but only in certain situations. The reliability of that transmission, for example, appears to break down when emotions are at their strongest. The face contorts. We can tell that something major has happened, but it's tough to tell that something is dramatically positive or devastatingly negative.